So uh...what are the controls?
Standard FPS controls for the overworld, you can cycle through multiple actions in places where you have multiple interactions by using Q and doing the selected action by pressing E.
On combat, you can use the primary skill (left and right click for normal attacks) and secondary skills if the weapon has any (holding shift while left or right clicking), the bar at the bottom hold the skills you can use while in Active Combat (irrelevant in Passive Combat, can be changed in the settings).